JPS5929992B2 - Video and audio playback device - Google Patents
Video and audio playback deviceInfo
- Publication number
- JPS5929992B2 JPS5929992B2 JP49127283A JP12728374A JPS5929992B2 JP S5929992 B2 JPS5929992 B2 JP S5929992B2 JP 49127283 A JP49127283 A JP 49127283A JP 12728374 A JP12728374 A JP 12728374A JP S5929992 B2 JPS5929992 B2 JP S5929992B2
- Authority
- JP
- Japan
- Prior art keywords
- video
- signal
- audio
- modulated
- audio signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Television Signal Processing For Recording (AREA)
Description
【発明の詳細な説明】
この発明は映像音声再生装置に関し、更に詳しくはビデ
オディスク・レコーディングシステムのように一つの記
録トラックに映像信号と音声信号とを周波数多重記録し
た記録媒体を再生する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video and audio reproducing device, and more particularly to a device for reproducing a recording medium in which a video signal and an audio signal are frequency-multiplexed recorded on one recording track, such as a video disc recording system. .
映像信号ならびに音声信号をそれぞれ相異なる周波数の
搬送波を用いて周波数変調して加算し、いわゆる周波数
多重して記録した記録媒体から、これを読み取つて得た
再生信号を周波数分離して映像復調および音声復調する
手段により、元の映像信号と音声信号とを得る再生装置
がある。Video signals and audio signals are frequency-modulated using carrier waves of different frequencies, added, and read from a so-called frequency multiplexed recording medium. The reproduced signal obtained by frequency-separating the signals is used for video demodulation and audio. There is a playback device that obtains the original video signal and audio signal by means of demodulation.
第１図に従来の方法による再生装置の一例を示す。１は
ビデオディスクであつて、音声信号ならびに映像信号が
それぞれ周波数変調され、周波数多重されて記録された
記録媒体である。FIG. 1 shows an example of a reproducing apparatus using a conventional method. Reference numeral 1 denotes a video disc, which is a recording medium in which audio signals and video signals are frequency-modulated and frequency-multiplexed and recorded.
２はビデオディスク１を駆動するモータ、３はビデオデ
ィスク１から信号を検出するピックアップである。2 is a motor that drives the video disc 1; 3 is a pickup that detects signals from the video disc 1;
６は音声帯域フィルタであり、ピックアップ３でビデオ
ディスク１から読み取られた検出信号１１から被変調音
声信号１２を分離する。Reference numeral 6 denotes an audio band filter, which separates the modulated audio signal 12 from the detection signal 11 read from the video disc 1 by the pickup 3.
１は音声復調器であり、被変調音声信号１２を復調して
、音声信号１３を音声出力端子４に出力する。Reference numeral 1 denotes an audio demodulator, which demodulates the modulated audio signal 12 and outputs the audio signal 13 to the audio output terminal 4.
一方、８は映像帯域フィルタ、９は映像復調器であつて
検出信号１１から被変調映像信号１４を分離して復調し
、映像出力端子５に映像信号１５を得る。第２図ａにビ
デオディスク１から検出された検出信号１１の周波数ス
ペクトルを示す。Ｓは搬送波周波数ｆｓで周波数変調さ
れた被変調音声信号、Ｐは搬送波周波数ｆｐで周波変調
された被変調映像信号である。ここで、ピックアップ３
においてその検出機構から不可避的に二次歪が発生する
場合、周波数多重されている被変調音声信号Ｓと被変調
映像信号Ｐは干渉しあつて、混変調信号Ｓ’が生じる。
もし映像帯域フィルタ８が被変調映像信号を分離するの
に必要十分でかつ被変調音声信号を十分減衰させる帯域
を有していても、混変調成分Ｓ’を除くことはできない
ので、第２図ｂに示すように復調後の映像信号１５は、
映像信号Ｐ’の他に混変調信号Ｓ’が復調された被変調
音声信号Ｓ″が混入していて、再生画面上にはビードと
して見え画質を劣化させる。従来の再生装置には以上の
ような欠点があつた。本発明の目的は上記した従来の再
生装置の欠点を無くし、被変調音声信号の混入を除去し
てビードのない再生画を得る再生装置を提供することに
ある。On the other hand, 8 is a video bandpass filter, and 9 is a video demodulator, which separates and demodulates the modulated video signal 14 from the detection signal 11 to obtain the video signal 15 at the video output terminal 5. FIG. 2a shows the frequency spectrum of the detection signal 11 detected from the video disc 1. S is a modulated audio signal frequency-modulated at a carrier frequency fs, and P is a modulated video signal frequency-modulated at a carrier frequency fp. Here, pickup 3
When second-order distortion is unavoidably generated from the detection mechanism, the frequency-multiplexed modulated audio signal S and modulated video signal P interfere with each other, resulting in a cross-modulated signal S'.
Even if the video bandpass filter 8 has a band that is necessary and sufficient to separate the modulated video signal and sufficiently attenuate the modulated audio signal, it is not possible to remove the cross-modulation component S'. As shown in b, the demodulated video signal 15 is
In addition to the video signal P', the modulated audio signal S'', which is the demodulated cross-modulation signal S', is mixed in, which appears as beads on the playback screen and degrades the image quality. The object of the present invention is to eliminate the above-described drawbacks of the conventional reproducing apparatus, and to provide a reproducing apparatus that eliminates the contamination of the modulated audio signal and obtains a bead-free reproduced image.
本発明の特徴は、映像復調器によつて復調した映像信号
から、音声帯域フイルタによつて分離した被変調音声信
号を差し引くことによつて、映像信号に混入した被変調
音声信号を除去することにある。The feature of the present invention is to remove the modulated audio signal mixed into the video signal by subtracting the modulated audio signal separated by the audio band filter from the video signal demodulated by the video demodulator. It is in.
以下、本発明を第３図に示す実施例に従つて詳細に説明
する。Hereinafter, the present invention will be explained in detail according to the embodiment shown in FIG.
第３図において第１図と同一符号は同一部分を示してい
る。第３図の１０は本発明の特徴とする減算器である。
映像信号１５には先に説明したように被変調音声信号が
混入している。そこで減算器１０において音声帯域フイ
ルタ６によつて分離した被変調音声信号１２を映像信号
１５から減算する。こうすることにより混入していた被
変調音声信号が減算器にて相殺されるので、映像出力端
子５に得られる映像信号１６をモニタに映出すればビー
ドのない再生画が得られる。なお、第３図に示した実施
例においては、減算器１０に入力される被変調音声信号
のレベルを調節する手段を図示していないが、減算器１
０の内部あるいは入力前にこの被変調音声信号１２のレ
ベルを映像復調器９によつて復調された映像信号中に含
まれる被変調音声信号と等しいレベルにあらかじめ調節
する手段が付加されていることは明らかである。以上述
べたように、本発明によれば復調した映像信号から、音
声帯域フイルタによつて分離した被変調音声信号を差し
引く手段を備えたので、ピツクアツプにて発生した被変
調音声信号と被変調映像信号との混変調成分が、被変調
音声信号として映像復調器で復調されて映像信号に混入
する成分を除去し、ビードのない再生画を得る効果があ
る。In FIG. 3, the same symbols as in FIG. 1 indicate the same parts. 10 in FIG. 3 is a subtracter which is a feature of the present invention.
The video signal 15 contains the modulated audio signal as described above. Therefore, the modulated audio signal 12 separated by the audio band filter 6 is subtracted from the video signal 15 in the subtracter 10 . By doing this, the mixed modulated audio signal is canceled out by the subtracter, so that if the video signal 16 obtained at the video output terminal 5 is displayed on a monitor, a reproduced image without beads can be obtained. Note that in the embodiment shown in FIG. 3, means for adjusting the level of the modulated audio signal input to the subtracter 10 is not shown;
Means is added to adjust the level of the modulated audio signal 12 to be equal to the level of the modulated audio signal contained in the video signal demodulated by the video demodulator 9, either within the 0 or before input. is clear. As described above, according to the present invention, since the present invention is provided with means for subtracting the modulated audio signal separated by the audio band filter from the demodulated video signal, the modulated audio signal generated in the pickup and the modulated video The cross-modulation component with the signal is demodulated as a modulated audio signal by a video demodulator, and the component mixed in the video signal is removed, thereby producing a reproduced image without beads.
第１図は従来の映像音声再生装置を説明するための図、
第２図は周波数スペクトルを示す図、第３図は本発明の
映像音声再生装置を説明するための図である。
１・・・・・・ビデオデイスク、２・・・・・・デイス
ク駆動モータ、３・・・・・・ピツクアツプ、４・・・
・・・音声出力端子く５・・・・・・映像出力端子、６
・・・・・・音声帯域フイルタ、Ｔ・・・・・・音声復
調器、計・・・・・映像帯域フイルタ、９・・・・・・
映像復調器、１０・・・・・・減算器。FIG. 1 is a diagram for explaining a conventional video and audio playback device.
FIG. 2 is a diagram showing a frequency spectrum, and FIG. 3 is a diagram for explaining the video and audio reproducing apparatus of the present invention. 1...Video disc, 2...Disc drive motor, 3...Pickup, 4...
...Audio output terminal 5...Video output terminal 6
...Audio band filter, T...Audio demodulator, total...Video band filter, 9...
Video demodulator, 10...subtractor.
Claims (1)
得た周波数多重映像音声信号を記録した記録媒体から、
これを読み取つて得た再生信号を周波数分離し、映像復
調および音声腹調する手段により元の映像信号と音声信
号を得る再生装置において、周波数分離された被変調音
声信号を分岐し、そのレベルを復調された映像信号中に
含まれる被変調音声信号に等しいレベルに調節して、該
復調映像信号から差し引く減算手段を映像信号出力手段
に設けたことを特徴とする映像音声再生装置。1. From a recording medium that records a frequency multiplexed video and audio signal obtained by modulating and adding a video signal and an audio signal,
In a playback device that obtains the original video signal and audio signal by frequency-separating the reproduced signal obtained by reading this, and performing video demodulation and audio modulation, the frequency-separated modulated audio signal is branched, and its level is adjusted. 1. A video and audio reproducing apparatus, characterized in that the video signal output means is provided with subtraction means that adjusts the level to be equal to the modulated audio signal contained in the demodulated video signal and subtracts it from the demodulated video signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49127283A JPS5929992B2 (en) | 1974-11-05 | 1974-11-05 | Video and audio playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49127283A JPS5929992B2 (en) | 1974-11-05 | 1974-11-05 | Video and audio playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5152715A JPS5152715A (en) | 1976-05-10 |
| JPS5929992B2 true JPS5929992B2 (en) | 1984-07-24 |
Family
ID=14956128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP49127283A Expired JPS5929992B2 (en) | 1974-11-05 | 1974-11-05 | Video and audio playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5929992B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144300Y2 (en) * | 1977-01-10 | 1986-12-13 | ||
| JPS6486364A (en) * | 1988-08-05 | 1989-03-31 | Teac Corp | Recording disk and manufacture thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS471063U (en) * | 1971-01-11 | 1972-08-10 |
-
1974
- 1974-11-05 JP JP49127283A patent/JPS5929992B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS471063U (en) * | 1971-01-11 | 1972-08-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5152715A (en) | 1976-05-10 |
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